<?php
require("db_conn.php");//包含连接文件
$sql="SELECT * FROM tb_recruittype where id=1 "; 
  $typers=$conn->query($sql);
  $typerows=$typers->fetch_all(MYSQLI_BOTH);  
$typers->free();

$sql="SELECT * FROM tb_recruittype where id limit 1,3 "; 
  $typenamers=$conn->query($sql);
  $typenamerows=$typenamers->fetch_all(MYSQLI_BOTH);  
$typenamers->free();